- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Subsurface data, produced over a decade of drilling, can now be used to reassess Devonian nomenclature in the Swan Hills area. It is proposed that the Swan Hills Member, the hydrocarbon producing unit of the Beaverhill Lake Formation be raised to formation status; the off-reef nodular shales or upper Beaverhill Lake is designated as the Waterways Formation (Murray, 1965); and the basal Beaverhill Lake is divided into the Fort Vermilion Formation and part of the Watt Mountain Formation. The redefined Swan Hills, Waterways, and Fort Vermilion are referred to as the Beaverhill Lake Group. Cross sections show their correlation from the Swan Hills area to the type areas north, northeast, and southeast. In the Swan Hills area, the Fort Vermilion and basal Swan Hills Formation are considered Middle Devonian in age, and the upper Swan Hills and the Waterways Formation Late Devonian.